Chido Obi-Martin has left Arsenal and is said to be on the verge of joining Premier League rivals Manchester United. This has been a mixed summer for the Arsenal academy. On one hand, the likes of Ethan Nwaneri and Myles Lewis-Skelly are making everyone proud with their performances on Arsenal’s USA tour. Sadly, on the flip side, three massive young talents have left the club – Reuell Walters, Amario Cozier-Duberry and most recently, Obi-Martin. Now, some fresh details have emerged about the latter. Reports have claimed that Chido Obi-Martin rejected Arsenal’s £15,000-a-week salary offer. Manc…